If you are used to Arta as a meausuring software, you will be able to import directly your files into Sofmea. In order to do this, in the 'Frequency response' window, click 'File' -> 'Export...' -> 'ASCII File' and save the corresponding file on the place you want. The only thing you have to care for before importing your file into Sofmea is to have only one piece of information such as the 'frequency response' or the 'phase'. Otherwise, Sofmea will interpret your file incorrectly.